lets all agree,the problem could well be my psu ,it could well not be.When I got my system i calculated how much power i would need and i think it was around the 600 mark.So it is not unreasnoable to think that my psu could have lost efficiency and is not providing enough power.Considering I have tried all software related avenues for a fix ,in the absense of any other ideas ,i may just have to buy another psu.